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We suggest an explanation of a sharp increase in the abundance of cosmogenicradiocarbon found in tree rings dated AD 775. The increase could originate fromhigh-energy irradiation of the atmosphere by a galactic gamma-ray burst. Weargue that, unlike a cosmic ray event, a gamma-ray burst does not necessarilyresult in a substantial increase in long-lived 10Be atmospheric production. Atthe same time, the 36Cl nuclide would be generated in the amounts detectable inthe corresponding ice core samples from Greenland and Antarctica. Thesepeculiar features allow experimental discrimination of nuclide effects causedby gamma-ray bursts and by powerful proton events.

AD 775 Pulse of Cosmogenic Radionuclides Production as Imprint of a Galactic Gamma-Ray Burst